Climate Effects on Subsoil Carbon Loss Mediated by Soil Chemistry.
| Title: | Climate Effects on Subsoil Carbon Loss Mediated by Soil Chemistry. |
|---|---|
| Authors: | Possinger AR; Department of Forest Resources and Environmental Conservation, Virginia Tech, Blacksburg, Virginia 24061, United States.; Weiglein TL; Department of Forest Resources and Environmental Conservation, Virginia Tech, Blacksburg, Virginia 24061, United States.; Bowman MM; Environmental Studies Program, University of Colorado Boulder, Boulder, Colorado 80303, United States.; Institute of Arctic and Alpine Research (INSTAAR), University of Colorado Boulder, Boulder, Colorado 80303, United States.; Gallo AC; Department of Forest Engineering, Resources and Management, Oregon State University, Corvallis, Oregon 97331, United States.; Hatten JA; Department of Forest Engineering, Resources and Management, Oregon State University, Corvallis, Oregon 97331, United States.; Heckman KA; Northern Research Station, USDA Forest Service, Houghton, Michigan 49931, United States.; Matosziuk LM; Department of Forest Engineering, Resources and Management, Oregon State University, Corvallis, Oregon 97331, United States.; Nave LE; University of Michigan Biological Station, Pellston, Michigan 49769, United States.; Department of Ecology and Evolutionary Biology, University of Michigan, Ann Arbor, Michigan 48109, United States.; SanClements MD; Institute of Arctic and Alpine Research (INSTAAR), University of Colorado Boulder, Boulder, Colorado 80303, United States.; Battelle, National Ecological Observatory Network (NEON), Boulder, Colorado 80301, United States.; Swanston CW; Northern Research Station, USDA Forest Service, Houghton, Michigan 49931, United States.; Strahm BD; Department of Forest Resources and Environmental Conservation, Virginia Tech, Blacksburg, Virginia 24061, United States. |
| Source: | Environmental science & technology [Environ Sci Technol] 2021 Dec 07; Vol. 55 (23), pp. 16224-16235. Date of Electronic Publication: 2021 Nov 23. |
| Publication Type: | Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S. |
| Language: | English |
| Journal Info: | Publisher: American Chemical Society Country of Publication: United States NLM ID: 0213155 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1520-5851 (Electronic) Linking ISSN: 0013936X NLM ISO Abbreviation: Environ Sci Technol Subsets: MEDLINE |
| Imprint Name(s): | Publication: Washington DC : American Chemical Society; Original Publication: Easton, Pa. : American Chemical Society, c1967- |
| MeSH Terms: | Carbon* ; Soil*; Climate Change ; Temperature |
| Abstract: | Subsoils store at least 50% of soil organic carbon (SOC) globally, but climate change may accelerate subsoil SOC (SOCsub) decomposition and amplify SOC-climate feedbacks. The climate sensitivity of SOCsub decomposition varies across systems, but we lack the mechanistic links needed to predict system-specific SOCsub vulnerability as a function of measurable properties at larger scales. Here, we show that soil chemical properties exert significant control over SOCsub decomposition under elevated temperature and moisture in subsoils collected across terrestrial National Ecological Observatory Network sites. Compared to a suite of soil and site-level variables, a divalent base cation-to-reactive metal gradient, linked to dominant mechanisms of SOCsub mineral protection, was the best predictor of the climate sensitivity of SOC decomposition. The response was "U"-shaped, showing higher sensitivity to temperature and moisture when either extractable base cations or reactive metals were highest. However, SOCsub in base cation-dominated subsoils was more sensitive to moisture than temperature, with the opposite relationship demonstrated in reactive metal-dominated subsoils. These observations highlight the importance of system-specific mechanisms of mineral stabilization in the prediction of SOCsub vulnerability to climate drivers. Our observations also form the basis for a spatially explicit, scalable, and mechanistically grounded tool for improved prediction of SOCsub response to climate change. |
| Contributed Indexing: | Keywords: base cation; climate sensitivity; organo-mineral; reactive metal; subsoil carbon |
| Substance Nomenclature: | 0 (Soil); 7440-44-0 (Carbon) |
| Entry Date(s): | Date Created: 20211123 Date Completed: 20211210 Latest Revision: 20211214 |
| Update Code: | 20260130 |
| DOI: | 10.1021/acs.est.1c04909 |
| PMID: | 34813696 |
| Database: | MEDLINE |
Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.